Crop rotation and bellows: what they have in common

1. Step 1. Crop rotation — uses — Plough. The three-field system with a heavy plough.
2. Step 2. Plough — uses — Horse collar. The horse collar made ploughing with horses possible.
3. Step 3. Horse collar — is made of — Leather. The collar and traces are leather.
4. Step 4. Leather — is material for — Bellows. Bellows are a leather bag.

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